1,909 days ago
Dominic Ford, Editor
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Comet C/2018 Y1 (Iwamoto) will make its closest approach to the Sun on 4 February, at a distance of 1.29 AU.
From Cambridge on the day of perihelion it will be visible in the morning sky, becoming accessible around 23:33, when it reaches an altitude of 21° above your south-eastern horizon. It will then reach its highest point in the sky at 03:08, 42° above your southern horizon. It will be lost to dawn twilight around 05:44, 30° above your south-western horizon.
The events that comprise the 2019 apparition of C/2018 Y1 (Iwamoto) are as follows:
| Date | Event |
| 04 Feb 2019 | Comet C/2018 Y1 (Iwamoto) passes perihelion |
| 11 Feb 2019 | Comet C/2018 Y1 (Iwamoto) passes perigee |
| 11 Feb 2019 | Comet C/2018 Y1 (Iwamoto) reaches peak brightness |
The table below lists the times when C/2018 Y1 (Iwamoto) will be visible from Cambridge day-by-day through its apparition:
| Date | Constellation | Comet visibility |
| 14 Jan 2019 | Virgo | Visible from 04:24 until 05:58 Highest at 05:58, 26° above S horizon |
| 16 Jan 2019 | Virgo | Visible from 04:07 until 05:57 Highest at 05:57, 27° above S horizon |
| 18 Jan 2019 | Virgo | Visible from 03:48 until 05:56 Highest at 05:45, 28° above S horizon |
| 20 Jan 2019 | Virgo | Visible from 03:28 until 05:55 Highest at 05:32, 28° above S horizon |
| 22 Jan 2019 | Virgo | Visible from 03:07 until 05:54 Highest at 05:19, 29° above S horizon |
| 24 Jan 2019 | Virgo | Visible from 02:43 until 05:53 Highest at 05:04, 30° above S horizon |
| 26 Jan 2019 | Virgo | Visible from 02:16 until 05:52 Highest at 04:47, 32° above S horizon |
| 28 Jan 2019 | Virgo | Visible from 01:45 until 05:50 Highest at 04:29, 33° above S horizon |
| 30 Jan 2019 | Virgo | Visible from 01:09 until 05:49 Highest at 04:08, 35° above S horizon |
| 01 Feb 2019 | Virgo | Visible from 00:24 until 05:47 Highest at 03:44, 38° above S horizon |
| 03 Feb 2019 | Virgo | Visible from 23:33 until 05:45 Highest at 03:15, 42° above S horizon |
| 05 Feb 2019 | Virgo | Visible from 22:34 until 05:43 Highest at 02:41, 47° above S horizon |
| 07 Feb 2019 | Leo | Visible from 21:24 until 05:41 Highest at 01:59, 53° above S horizon |
| 09 Feb 2019 | Leo | Visible from 20:05 until 05:39 Highest at 01:09, 60° above S horizon |
| 11 Feb 2019 | Leo | Visible from 18:41 until 05:37 Highest at 00:11, 68° above S horizon |
| 13 Feb 2019 | Cancer | Visible from 18:20 until 04:58 Highest at 23:06, 74° above S horizon |
| 15 Feb 2019 | Gemini | Visible from 18:23 until 04:13 Highest at 22:07, 79° above S horizon |
| 17 Feb 2019 | Gemini | Visible from 18:25 until 03:26 Highest at 21:15, 82° above S horizon |
| 19 Feb 2019 | Gemini | Visible from 18:28 until 02:43 Highest at 20:30, 83° above S horizon |
| 21 Feb 2019 | Auriga | Visible from 18:30 until 02:05 Highest at 19:54, 83° above S horizon |
| 23 Feb 2019 | Auriga | Visible from 18:32 until 01:32 Highest at 19:24, 84° above S horizon |
A more detailed table of C/2018 Y1 (Iwamoto)'s position on each night is available here. A diagram of the orbit of C/2018 Y1 (Iwamoto) is available here.
Finder chart
The chart below shows the path of C/2018 Y1 (Iwamoto) over the course of its apparition, as calculated from the orbital elements published by the Minor Planet Center (MPC). It is available for download, either on dark background, in PNG, PDF or SVG formats, or on a light background, in PNG, PDF or SVG formats. It was produced using StarCharter.
Comet brightnesses
Comets are intrinsically highly unpredictable objects, since their brightness depends on the scattering of sunlight from dust particles in the comet's coma and tail. This dust is continually streaming away from the comet's nucleus, and its density at any particular time is governed by the rate of sublimation of the ice in the comet's nucleus, as it is heated by the Sun's rays. It also depends on the amount of dust that is mixed in with that ice. This is very difficult to predict in advance, and can be highly variable even between successive apparitions of the same comet.
In consequence, while the future positions of comets are usually known with a high degree of confidence, their future brightnesses are not. For most comets, we do not publish any magnitude estimates at all. For the few comets where we do make estimates, we generally prefer the BAA's magnitude parameters to those published by the Minor Planet Center, since they are typically updated more often.
No estimate for the brightness of comet C/2018 Y1 (Iwamoto) is currently available.
The comet's position at perihelion will be:
| Object | Right Ascension | Declination | Constellation | Magnitude |
| Comet C/2018 Y1 (Iwamoto) | 12h20m50s | 5°08'S | Virgo | 7.1 |
The coordinates are given in J2000.0.
The sky on 4 Feb 2019
| The sky on 4 February 2019 | ||||||||||||||||||||||||||||||||||
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0% 29 days old |
All times shown in EST.
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Source
This event was automatically generated on the basis of orbital elements published by the Minor Planet Center (MPC) , and is updated whenever new elements become available. It was last updated on 02 Jan 2024.
Image credit
© Andy Roberts 1997. Pictured comet is C/1995 O1 Hale-Bopp.